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FEATURES
•Displays TDS levels of the feed water and product water with in & out electrode probes.
•Highly efficient and accurate due to its advanced microprocessor technology.
•Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
•Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)
•Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
•Comes equipped with Mur-lok® Quick-Connect T-fittings.
•Installs quickly and easy

I’ve been using this in-line tester on my RO/DI unit for a few weeks now. I have found to be very very accurate and easy to use as I have mounted it directly to the RO/DI unit its self. I have had the readings double checked at a SW LFS with there almost lab quality tester a few times now and the reading have been confirmed as accurate each and every time.